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Finding the Fourth Proportional to 957.46, 1,320.41 and 642.47

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Solution

The fourth proportional to 957.46, 1,320.41 and 642.47 is: 886.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.46 : 1,320.41 = 642.47 : x
  2. Step 2: Convert to fraction form
    957.46/1,320.41 = 642.47/x
  3. Step 3: Cross multiply
    957.46x = 1,320.41 × 642.47
  4. Step 4: Simplify right side
    957.46x = 848,323.81
  5. Step 5: Solve for x
    x = 848,323.81/957.46
  6. Step 6: Final answer
    x = 886.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.